Have you really thought about the work it takes to recover from something like that? The level of trust and forgiveness you have to have?
An EA is really not that different from a PA. For some people sex is just sex but an emotional connection to someone else is difficult to overcome. You're learning that now.
You can and should have boundaries to protect yourself. have you read much about boundaries in relationships? If she is dating this guy, she's already crossed an important boundary.
How can you best protect you?
Me 57/H 58 M36 S 2.5yrs R 12/13
Let me give up the need to know why things happen as they do. I will never know and constant wondering is constant suffering. Caroline Myss